/*
 * [New BSD License]
 * Copyright (c) 2011-2012, Brackit Project Team <info@brackit.org>  
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Brackit Project Team nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.brackit.xquery.compiler.optimizer.walker.topdown;

import static org.brackit.xquery.compiler.XQ.GeneralCompEQ;
import static org.brackit.xquery.compiler.XQ.GeneralCompGE;
import static org.brackit.xquery.compiler.XQ.GeneralCompGT;
import static org.brackit.xquery.compiler.XQ.GeneralCompLE;
import static org.brackit.xquery.compiler.XQ.GeneralCompLT;
import static org.brackit.xquery.compiler.XQ.GeneralCompNE;
import static org.brackit.xquery.compiler.XQ.ValueCompEQ;
import static org.brackit.xquery.compiler.XQ.ValueCompGE;
import static org.brackit.xquery.compiler.XQ.ValueCompGT;
import static org.brackit.xquery.compiler.XQ.ValueCompLE;
import static org.brackit.xquery.compiler.XQ.ValueCompLT;
import static org.brackit.xquery.compiler.XQ.ValueCompNE;

import org.brackit.xquery.compiler.AST;
import org.brackit.xquery.util.Cmp;

/**
 * @author Sebastian Baechle
 * 
 */
public class CmpUtil {
	public static Cmp cmp(AST cmpNode) {
		switch (cmpNode.getType()) {
		case ValueCompEQ:
			return Cmp.eq;
		case ValueCompGE:
			return Cmp.ge;
		case ValueCompLE:
			return Cmp.le;
		case ValueCompLT:
			return Cmp.lt;
		case ValueCompGT:
			return Cmp.gt;
		case ValueCompNE:
			return Cmp.ne;
		case GeneralCompEQ:
			return Cmp.eq;
		case GeneralCompGE:
			return Cmp.ge;
		case GeneralCompLE:
			return Cmp.le;
		case GeneralCompLT:
			return Cmp.lt;
		case GeneralCompGT:
			return Cmp.gt;
		case GeneralCompNE:
			return Cmp.ne;
		default:
			throw new IllegalArgumentException();
		}
	}

	public static int type(Cmp cmp, boolean isGCmp) {
		switch (cmp) {
		case eq:
			return (isGCmp) ? GeneralCompEQ : ValueCompEQ;
		case ge:
			return (isGCmp) ? GeneralCompGE : ValueCompGE;
		case gt:
			return (isGCmp) ? GeneralCompGT : ValueCompGT;
		case le:
			return (isGCmp) ? GeneralCompLE : ValueCompLE;
		case lt:
			return (isGCmp) ? GeneralCompLT : ValueCompLT;
		case ne:
			return (isGCmp) ? GeneralCompNE : ValueCompNE;
		default:
			return -1;
		}
	}

	public static boolean isGCmp(AST cmp) {
		switch (cmp.getType()) {
		case GeneralCompEQ:
		case GeneralCompGE:
		case GeneralCompGT:
		case GeneralCompLE:
		case GeneralCompLT:
			return true;
		default:
			return false;
		}
	}
}
